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Estimating torque

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Don

07-08-2003 10:07:01




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Am working on an '89 Taurus and have to tighten the front crankshaft vibration damper/pully to 141-169
ft-lbs. No easy way to secure the vibration damper/pully from rotating, so am using an electric impact wrench rated max. 300 ft-lbs.

I know this is not ideal, but could I snug it and give it 1-2 short bursts to tighten the nut and get it close to the correct 140-170 ft-lb tightness? Does anyone have any experience in doing this? Thanks in advance for your help.

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MarkB

07-09-2003 05:05:01




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 Re: Estimating torque in reply to Don, 07-08-2003 10:07:01  
You can buy a tool at any auto parts store to hold the flywheel. I have to say that the "rope in a sparkplug hole" trick is probably an easier way to go if you have the head on: you don't need a helper.

I'm told that sticking rope down the sparkplug hole is commonly used by aircraft mechanics to fix stuck valves. A stuck valve can be freed in half an hour this way versus pulling the jug, which is an expensive proposition.

Whatever you do, don't rely on an impact wrench to torque the damper; if the bolt comes loose you'll wreck the crank.

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Nolan

07-09-2003 03:54:48




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 Re: Estimating torque in reply to Don, 07-08-2003 10:07:01  
Rope down a sparkplug holes does wonderfully at holding an engines crankshaft.



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Slowpoke

07-09-2003 00:03:47




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 Re: Estimating torque in reply to Don, 07-08-2003 10:07:01  
I just did a '95 Neon. I used a 4" length of 3" pipe, cut 3 equaly spaced notches around one end to fit the vib damper pulley arms. Three 'fingers' were welded on the opposite end to fit the cam pulley arms. Then I welded a �x1x12" arm on the finger end so it would jam under the running gear and hold the vib damper. The 12" arm was welded to the outside edge to allow a socket to fit through the center and tighten the pulley bolt. Dimensions can be changed to suit other situations. The fingers and recesses are cut so they won't slip off the pulley arms, and can be used in either direction. I found it easier to cut and add fingers than to cut and file large notches. The thing sort of looks like an oversized plumbing tool for sink and tub drain cross removal.

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David - OR

07-08-2003 13:26:29




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 Re: Estimating torque in reply to Don, 07-08-2003 10:07:01  
Why don't you borrow Dell's "rope trick" from the 8n/2n/9n board?

Remove the #1 spark plug. Bring the engine around until #1 is coming up on the compression stroke. (Actually any cylinder will do, but you want one in which both valves are closed). Stuff a bunch of 1/4 inch soft cotton clothesline rope into the spark plug hole -- enough to squeeze between the piston and head and prevent the engine from turning. Obviously, leave a free end so you can retrieve your rope later.

Tighten the damper bolt with a torque wrench. When done, back the engine off just a bit, pull the rope out, put the spark plug back, and you are done.

If the damper bolt is left-hand threaded, bring the engine past the compression stroke and into the power stroke, then put the rope in.

Do an archive search on "rope trick" to read about it.

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Ben in KY

07-08-2003 12:10:45




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 Re: Estimating torque in reply to Don, 07-08-2003 10:07:01  
I would not recommend that method, very unreliable. You need to secure the crank by locking the teeth on the flywheel someway. If you don't have a torque wrench pull it as tight as you can get it with a half inch breaker bar. That will probably work, but I would recommend getting a torque wrench, even a cheapo one is better than none.



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JD-Tractor in NY

07-09-2003 20:59:49




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 Re: Re: Estimating torque in reply to Ben in KY, 07-08-2003 12:10:45  
Don't know where you are located but most of the auto chains such as autozone or advanced auto will loan or rent you such tools at least here in Western NY



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